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Echo is a phenomenon that occurs when microphones pick up the audio reproduced from the speakers. Echo tends to occur more often with an audio conference system than with a telephone set on which the microphone and speaker are isolated from each other. The Projectphone incorporates a high-performance adaptive echo canceller that reproduces voices with higher clarity by eliminating echoes.
By lowering the microphone gain when playing back sound from the unit's own speakers, echo is prevented by physically ensuring that sound is not picked up by the microphones in the first place. Because the microphones are turned OFF while sound is output from the speakers, audio occurs in a one-way "transceiver" format. However, this increases the likelihood of audio cut-out.
This technique suppress echoes by prioritizing the microphones nearest the loudest voices and switching off the ones nearest the softest voices.
Audio is one-way only. Sound cuts out easily.
Any voices picked up from the speakers by the microphones are cancelled with filters (signal processing).
Two-way talks are possible without audio cut-out.
